Abstract

1. Schulte Rd. Replacement Bridge # 501 Edgard E. RizoEngineering, Hartnell College, Salinas, CA 93908 Enrique M. Saavedra, Senior Civil Engineer, Monterey County; Public Works, Construction Section Conclusions During the period June 11 to August 3rd, project management was provided for the replacement of Schulte Bridge. Additionally, the intern experienced many aspects of civil engineering, especially in the construction aspect of the design and implementation of bridge building. Not only was I able to see the work in the construction zone, but as well office work needed prior and during the construction . Working with the Cal Trans Foundation Manual was of great use because it help the team obtain the blow count of the 12 batter H-piles, 12 plum H-piles and the column pile. It was interesting to observe the complex design come to life. Although it took approximately 12 years for the construction of the bridge to take place. Is now in action and the completion of the bridge will be made according to plans. I may not get to see all the work been performed but I have an idea of what is that will take place thanks to a set of plans created by a Civil Engineer. Besides the experience and knowledge obtained in bridge building, I was also working with the Surveying crew, plotted Points,and installed monuments. Over all it was a great experience to work in the Monterey County Public Works Department. Data and Result Prior to the pile driving a series of calculation must be made to satisfy Cal Trans specifications. Cal Trans specifies that, “... Hammer shall develop sufficient energy to drive the piles as a penetration rate of not less than 1/8 inch per blow at the specified nominal resistance.” (Cal Trans, 49-1.05 Driving Equipment) Below is an example of the calculations for this project. Example: Calculation of Minimum Hammer Energy Given: Delmag D30-32 Hammer Weight = 14,010lb Manufacture’s Maximum Energy Rating: 75,970 Nominal Resistance: 140 kip N= [10^(Ru + 124/ (1.83 (75,970)^1/2))]/.083 N=4.02 approximately 4 blows/ft S= Penetration per blow in inches S= (N^-1)*(12 ft) = [(4.02 blows/ft)^-1] * (12 ft) = 2.99 in/ blow > .125 in blow Therefore meets the energy requirements of S.S49-1.05 As soon as the hammer meets standards, calculation for establishing a blow count chart is conducted. Given: Delmag D30-32 Hammer Weight = 14, 010 Example: Maximum stroke = 11.4 ft Er = (11.4 ft) * (14,010) Ru = 140 kip Ru = [(1.83 * Er)^1/2 *] * [Log10 (.83 * N) -124] Solve For N N= [10^(Ru + 124/1.83 *( Er)^1/2))]/.83 N= 2.77 blows/ft Approximately 3 blows/ft For every change in height for the release of the hammer a separate calculation is made. For the H plumed piles the following excel sheet was created to establish a blow count. Methods and Materials Driven piles are used where foundation material will not support a footing foundation or discourages the use of cast-in-drilled-hole (CIDH) concrete piles. The process of pile driving is the following; the pile is force into the ground thereby displacing the soil mass across the whole cross section of the pile. The type of site specific construction challenges for pile driving are; limited space, noise level, and unusual tip or bearing requirements. There are different operating hammers that conduct the pile driving that must meet the standard specifications. Those hammers can be operated by steam, air, or diesel as specified by Cal Trans, “Impact hammer shall be steam, hydraulic, air or diesel hammer…”(Cal Trans, 49-1.05 Driving equipment). For Schulte Rd. replacement bridge two different diesel hammers were utilized. One was a Pilco and the other a Delmag. Both work as followed; a weight is lifted a measure distance by means of a rope or cable and allowed to freefall or drop and strike the a pile cap block . The hammer is driven by a rudimentary one- cylinder diesel engine and is fed from a fuel tank by a pump mounted directly on the hammer. The Delmag (D 30-32) was used for 24 H-piles that where driven in Abutment 1 and Abutment 3. Abstract The purpose of this internship was to provide project management for the replacement of the Schulte Road bridge on the Carmel River. During the summer of 2012, Monterey County Department of Public Works initiated the replacement of an existing one lane with a new two lane bridge. The project has an overall cost estimate of $3,360,000. The location of the bridge proved to be an interesting yet challenging location. The normally-loud construction activities, had to be managed in a way that minimized the disruption and inconvenience to the nearby residents. Also two nearby RV parks complicated the construction further. Tourist constantly came and went from the RV park. Their oversized width and weight made working around the one-lane bridge difficult. Furthermore, the old bridge is of significance to the community of Carmel Valley not only because it allows them to get across the river but because its historical importance. The bridge was constructed shortly after World War II with salvage steel from navy ships. The new bridge project is schedule to be completed in two phases spanning a total of two years. For the successful execution of the project, effective planning is essential. The design and execution of the project needed to consider the environmental impact of the job, scheduling, budgeting, construction site safety, availability of building materials, logistics, inconvenience to the public caused by construction delays and bidding. The objective of the summer research was to get an understanding of the construction aspect of bridge building. The most important part of the construction of a bridge is building its foundation. The key aspect of foundation when it comes to bridges construction building is pile driving. Figures 6- Enrique Saavedra (P.E / Senior Civil Engineer) and EdgardRizo (Hartnell Student/ Intern). Autobiographical Info. The intern will be continuing his education at Sacramento State University in the Fall of 2012. For Pier 2 (center) a diesel hammer Pilco was used to drive one steel column 4 feet and 6 inches in diameter and 66 feet tall. Another 17 feet need to be welded so that it will reach compression ratio to get the amount of energy and penetration per blow required. The calculation showed 66 feet that where needed to obtain friction to bearing capacity. The amount needed was 2,200 kips and obtained was 1,400 kips. The extra 17 feet were required to reach 2,600 kips, more that enough to finalized the pile driving. Figures 3-4 Schulte Rd. Center Pier. Phase 1 of bridge. Figure 1. Schulte Rd. Clearing and grubbing. Acknowledgments Thanks to: Enrique M Saavedra (P.E Senior Civil Engineer), Jose Luis Gomez (Construction/ Project Resident Engineer), Billy Issa ( Structure Representative/ Project Resident Engineer), Michael Geogtz ( County Surveyor), Jesse J. Luis (Engineer Technician), Alberto Mejia (Construction/ Engineering Aide III) Thanks to Andy Newton at Hartnell College. The internship was funded by a NSF Advanced Technology Education Grant Figures 5 Schulte Rd. Center Pear. Welded. Figure 2. Schulte Rd. Preparation for pile driving on abutment 1, abutment 3 and pier 2.